Sierra Bullets 300 AAC Blackout Load Data

Test Specifications/Components

Firearm Used: Universal Receiver

Barrel Length: 16″

Twist: 1-8’’

Case: Hornady

Trim-to Length: 1.363″

Primer: Winchester WSR

Remarks:

The 300 AAC Blackout (300 BLK, or 7.62x35mm) was created by Advanced Armament Corp. and Remington in order to provide the military with a way to shoot .30 caliber bullets from the M4 platform with only a barrel change. It has since become popular for a wide range of uses including hunting and home defense.

The cartridge shares case-head dimensions and body taper with the .223 Remington. Not only does this allow for compatibility with existing magazines and bolts, but it allows reloaders to form their own brass from cut-down 5.56mm or .223 cases – ensuring brass supply even in the event of a shortage of factory brass.

The 300 AAC Blackout is a similar concept to previous wildcats, such as the 30-221 and 300 Fireball, as well as the proprietary 300 Whisper®, except that 300 BLK was the first to be a SAAMI approved cartridge and any company is free to make firearms or ammunition.

300 AAC Blackout is also finding use with hunters, who may not have been able to legally hunt with .223 in their state, and who prefer .30 caliber bullets for medium-sized game. It provides similar effectiveness to the 7.62×39 or the slightly more powerful 30-30 cartridges except works in the more up-to-date AR15 platform. Effective range for hunting is about 100-150 yards.

Click here to download Sierra Bullet’s 300 AAC Blackout Load Data for the 5th Edition Manual

INDICATES MAXIMUM LOAD – USE CAUTION
LOADS LESS THAN MINIMUM CHARGES SHOWN ARE NOT RECOMMENDED.

INDICATES MAXIMUM LOAD – USE CAUTION
LOADS LESS THAN MINIMUM CHARGES SHOWN ARE NOT RECOMMENDED.

INDICATES MAXIMUM LOAD – USE CAUTION
LOADS LESS THAN MINIMUM CHARGES SHOWN ARE NOT RECOMMENDED.

INDICATES MAXIMUM LOAD – USE CAUTION
LOADS LESS THAN MINIMUM CHARGES SHOWN ARE NOT RECOMMENDED.

INDICATES MAXIMUM LOAD – USE CAUTION
LOADS LESS THAN MINIMUM CHARGES SHOWN ARE NOT RECOMMENDED.

INDICATES MAXIMUM LOAD – USE CAUTION
LOADS LESS THAN MINIMUM CHARGES SHOWN ARE NOT RECOMMENDED.


INDICATES MAXIMUM LOAD – USE CAUTION
LOADS LESS THAN MINIMUM CHARGES SHOWN ARE NOT RECOMMENDED.

INDICATES MAXIMUM LOAD – USE CAUTION
LOADS LESS THAN MINIMUM CHARGES SHOWN ARE NOT RECOMMENDED.

 

INDICATES MAXIMUM LOAD – USE CAUTION
LOADS LESS THAN MINIMUM CHARGES SHOWN ARE NOT RECOMMENDED.

INDICATES MAXIMUM LOAD – USE CAUTION
LOADS LESS THAN MINIMUM CHARGES SHOWN ARE NOT RECOMMENDED.

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17 Responses to Sierra Bullets 300 AAC Blackout Load Data

  1. Brittius says:

    Reblogged this on .

    Like

  2. Dustin mckee says:

    If you guys had bothered to ask people what powder they would like to see lil gun would definitely be on that list. I would say 10 times more people use lil gun than R7 for subsonic loads.

    Like

  3. Holt Bodinjson says:

    Why not give JD Jones credit for the development of the 300 Whisper, which AAC tweaked into the 300 AAC Blackout by increasing the length of the chamber throat 0.015″ and SAAMI-ed it.

    Like

  4. Pingback: NEW: Sierra Bullets .300 AAC Blackout Reloading Data - AK Arms

  5. Pingback: NEW: Sierra Bullets .300 AAC Blackout Reloading Data | Firearms Life

  6. Jeff Whatley says:

    will these loads cycle an AR?

    Like

    • They should. – Duane Siercks, Ballistic Technician

      Like

      • Fred says:

        220 g round nose / 9.9 g H110 cycles 8.5″ and 16″ barrels no issues.

        Like

      • DAN says:

        In my 16.5″, X95 Sierra 220 grain RN with 11.2 grains of H110 WILL NOT cycle. In my Palmetto State Armory 7.5″ upper the load functions perfectly ! What could be the problem with the load in the 16.5″ ?

        Like

    • Mike says:

      A carbine length gas system (one comment mentioned 16.5 inch gun would not cycle the action) will not work with subsonic loads in 300 blackout. There may be rate exceptions but your in for a lot of frustration if you go that route. You MUST have a pistol length gas system. My TSAR 11.5″ upper is flawless so far.

      Liked by 1 person

  7. Patrick Casey says:

    How do you guys get different data for Win 296 and H110? Hodgdon reports that they are the identical powder under different labels.???

    Like

    • DAN says:

      My exact same question.

      Like

    • Greg Bentzinger says:

      While the powder formulas are identical, the chrono testing is likely from different production lots. You may have a great load that is pushing max and loading from an 8lb keg, and a few years later you buy another keg. Smart and safe loader will back off the load and work it back up simply due to powder age and lot variation.

      Like

  8. Ryan T Coomer says:

    You all show older data in the 300 using lil gun for a load workup option. Is that obsolete now, or not recommended. Using 125 gr prohunter

    Like

  9. Jim in NC says:

    I really appreciate the updated data, I was working on subsonic loads and Sierra did the work for me. That’s a lot of work already done that I only need to tweak for my rifle, however when I chrono these loads Sierra is pretty much dead on!
    Now for preparations for 2018 Bear season…
    Thanks

    Like

  10. Dec says:

    The data is all wrong anyway. Example 220gr subsonic data there for h4198 and reloader 7… two things…first not in anyway subsonic…they are high velocity. Second stupidly and even dangerously compressed loads…
    If you folks want really figures use quick load…this data and noslers data is bogus.
    Want a subsonic load using reloader 7 or h4198? Oal 2.260 8.7 grains

    Like

  11. Russell Cowley says:

    Quick Load program is, buy their own admission should NEVER be used over ANY published data. I have used this program for years and tke it with a very large grain of salt!

    Like

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